Part # 4513004111B0 is the button assembly for the horn but code B1801 is a broken clock spring so I'd do like what Nitro375 and take it somewhere else to get a second opinion. The broken clock spring problem seems to be quite common.

Dealer contacted Toyota rep and they agreed to pay the parts. Looking at the receipt, it appears the airbag/pad was not the problem since the light came back on after the unit was replaced. The dealer then replaced the wire (can't remember exact name). They said it was shorting on certain turns which is why the light was intermittent.

All good now plus I have a new airbag and pad. Only problem is that the tech put the steering wheel on slightly off center so it's going back soon to have it straightened out.

Dealer contacted Toyota rep and they agreed to pay the parts. Looking at the receipt, it appears the airbag/pad was not the problem since the light came back on after the unit was replaced. The dealer then replaced the wire (can't remember exact name). They said it was shorting on certain turns which is why the light was intermittent.

All good now plus I have a new airbag and pad. Only problem is that the tech put the steering wheel on slightly off center so it's going back soon to have it straightened out.

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how did you get toyota to pay for this? i think that toyota should fix this for free, because there is no way i can break this myself and my life can depend on it. Good getting it fixed!!! i i didn't have the 1,100$ to pay at the time.